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Tankless W ater Heater System Design Manual Plumbing schematics for single and multiple tankless water heaters in use with domestic systems, recirculation, and storage tanks. PRINTED 0708 186965-000[...]
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2 Certifications .................................................................................. 3 Water Quality and Scale ................................................................ 4 Pump Sizing for Circulation .......................................................... 5 T able of Contents Tank Water Heaters in a Circulation Loop Addition[...]
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3 Approvals Certified to applicable U.S. standards for appliances using gas or other petroleum fuel. Certified to applicable Canadian standards for appliances using gas or other petroleum fuel. Certified by the Uniform Plumbing Code (UPC) Certified by National Sanitation Foundation (NSF), www.nsf.org (indoor models must use the NSF approved top gua[...]
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4 W ater Quality and Scale A complete water analysis and an unde rstanding of system requirements are needed to prote ct the tankless water heaters and water heating systems from scale. Water analysis shows whether water is hard or soft. Hard water, unless treated, will cause scaling or liming of the heat exchanger. The rate of scaling increases wi[...]
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5 Pump Sizing for Circulation 1. Use the chart below or one appropriate for your co nditions to determine the heat loss in the length of the hot water supply and return piping. For example, 100 ft of 1-1/2 in bare copper tubing results in a heat loss of 5300 Btu/h. 2. Determine the acceptable temperature drop at the last fixture in the loop. For ex[...]
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6 T ank W ater Heaters in a Circulation Loop The following applies when using a tank water heater (gas or electric) to provide heat for a circulation loop. Drawing WH-1-RGE is an example. The heat output of the tank must be equal to or greater than the calculated circulation loop heat loss. (Reference page 6, Step 1 on calculating heat loss). Elect[...]
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The following applies when using tankless water heaters to recover a storage tank. Drawing WH-1-B is an example. Tankless water heaters have a pressure loss which must be considered in the system design. Reference the pressure loss curve for the heater m odel being used to determine the pump size for the desired recovery rate. For recommended pump [...]
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8 Pressure Loss Curves Pressure Loss (psi) Water Flow (gpm) 0. 0 5. 0 10. 0 15. 0 20. 0 25. 0 30. 0 35. 0 40. 0 45. 0 01 234 56 789 1 0 1 1 0. 0 10. 0 20. 0 30. 0 40. 0 50. 0 60. 0 Pressure Loss (ft head) 705 305 i 505 305 e[...]
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Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion C hec k Valv e Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-1 Domestic Hot W ater - S tandard Installation 1 Tankless Water Heater Preferred Piping Installation G a s S u p p ly 3 / 4 " C o l d W a t e r[...]
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Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion C hec k Valv e Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-2 Domestic Hot W ater - S tandard Installation 2 Tankless W ater Heaters Preferred Piping Installation February 27, 2008 This is not an engineering [...]
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Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion Ch e c k V a l ve Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-3 Domestic Hot W ater - S tandard Installation 3 Tankless W ater Heaters Preferred Piping Installation February 27, 2008 This is not an engineeri[...]
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Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion C hec k Valv e Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-4 Domestic Hot W ater - S tandard Installation 4 Tankless W ater Heaters Preferred Piping Installation February 27, 2008 This is not an engineering [...]
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Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion Ch e c k V a l ve Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-5 Domestic Hot W ater - S tandard Installation 5 Tankless W ater Heaters Preferred Piping Installation February 27, 2008 This is not an engineeri[...]
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Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion Ch e c k V a l ve Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-6 Domestic Hot W ater - S tandard Installation 6 Tankless W ater Heaters Preferred Piping Installation February 27, 2008 This is not an engineeri[...]
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Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion C hec k Valv e Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-1-D Domestic Hot W ater - O p t i o n a l F r eeze Protection 1 Outdoor Tankless W ater Heater Preferred Piping Installation June 11, 2007 This is n[...]
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Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion C hec k Valv e Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-2-D Domestic Hot W ater - O p t i o n a l F r eeze Protection 2 Outdoor Tankless W ater Heaters Preferred Piping Installation February 27, 2008 This[...]
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Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion C hec k Valv e Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-3-D Domestic Hot W ater - O p t i o n a l F r eeze Protection 3 Outdoor Tankless W ater Heaters Preferred Piping Installation February 27, 2008 This[...]
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Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion C hec k Valv e Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-6-D Domestic Hot W ater - O p t i o n a l F r eeze Protection 6 Outdoor Tankless W ater Heaters Preferred Piping Installation February 27, 2008 This[...]
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Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion C hec k Valv e Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-1-RGE Domestic Hot W ater - C i r c u l a t i o n S y s t e m s 1 Tankless W ater Heater with Gas or Electric Tank Preferred Piping Installation Feb[...]
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Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion Ch e c k V a l ve Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-1-R Domestic Hot W ater - C irculation Systems 1 Tankless W ater Heater Optional Piping Installation June 11, 2007 This is not an engineering dra[...]
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Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion C hec k Valv e Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-2-RGE Domestic Hot W ater - C i r c u l a t i o n S y s t e m s 2 Tankless W ater Heaters with Gas or Electric Tank Preferred Piping Installation Fe[...]
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Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion C hec k Valv e Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-2-R Domestic Hot W ater - Circulation Systems 2 Tankless W ater Heaters Optional Piping Installation February 27, 2008 This is not an engineering dr[...]
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23 Domestic Hot Water - Circulation Systems 3 Tankless Water Heaters with Gas or Electric Tank Preferred Piping Installation Tankless Water Heater Tankless Water Heater Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion C hec k Valv e Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boi[...]
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24 Tankless Tankless Tankless Tankless Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion Ch e c k V a l ve Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-6-RGE Domestic Hot W ater - C i r c u l a t i o n S y s t e m s 6 Tankless W ater Heaters with Gas or Elec[...]
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25 Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion C hec k Valv e Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-1-B Domestic Hot W ater - Backup Storage 1 Tankless W ater Heater Preferred Piping Installation February 27, 2008 This is not an engineering draw[...]
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26 Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion C hec k Valv e Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-1-B-R Domestic Hot W ater - Backup Storage / Circulation 1 Tankless W ater Heater Preferred Piping Installation February 27, 2008 This is not an [...]
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27 Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion C hec k Valv e Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-2-B Domestic Hot W ater - Backup Storage 2 Tankless W ater Heaters Preferred Piping Installation February 27, 2008 This is not an engineering dra[...]
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28 Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion Ch e c k V a l ve Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-2-B-R Domestic Hot W ater - Backup Storage / Circulation 2 Tankless W ater Heaters Preferred Piping Installation February 27, 2008 This is not[...]
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29 Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion Ch e c k V a l ve Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-3-B Domestic Hot W ater - B a c k u p S t o r a g e 3 Tankless W ater Heaters Preferred Piping Installation February 27, 2008 This is not an e[...]
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30 Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion C hec k Valv e Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-3-B-R Domestic Hot W ater - Backup Storage / Circulation 3 Tankless W ater Heaters Preferred Piping Installation February 27, 2008 This is not an[...]
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31 Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion C hec k Valv e Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-6-B Domestic Hot W ater - Backup Storage 6 Tankless W ater Heaters Preferred Piping Installation February 27, 2008 This is not an engineering dra[...]
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32 Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion C hec k Valv e Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e WH-6-B-R Domestic Hot W ater - Backup Storage / Circulation 6 Tankless W ater Heaters Preferred Piping Installation February 27, 2008 This is not an[...]
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Drawing Number: Drawing Date: Pres s ure R elief Valv e 3/ 4" Ball Valv e 3/ 4" U nion C hec k Valv e Ke y S Pres s ure R egulat or C irc ulating Pum p Solenoid Valv e Boiler D rain Valv e M-1-F 1 Tankless W ater Heater Maintenance - Scale Flush Procedure June 11, 2007 This is not an engineering drawing; it is intended only as a guide and[...]
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34 Notes[...]
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35 Notes[...]
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• 500 T ennessee Waltz Parkway • Ashland, TN 37015 •[...]